论文标题
具有单脉冲精度的放大激光脉冲的微米尺度网格模式的声学全息图
Acousto-optic holography for micrometer-scale grid patterning of amplified laser pulses with single-pulse accuracy
论文作者
论文摘要
许多光学系统都使用声学镜来快速转向光。然而，声学（AO）光衍射允许在包括全息图在内的更广泛的意义上操纵和塑造光场。尽管声学设备以无可争议的速度运行，但根据模拟串行数据传输的不同，它们是一维（1D）衍射设备，因此具有与常见2D空间光调制器区别的使用方式。与放大激光源的结合允许将AO衍射模式的串行堆积，以避免由于声波进程而导致的输出光束中的相差。伪2D全息图建立了两个交叉的AO偏转器，用于双轴空间调制的输入阶段，并且可选地具有其幅度。在这种配置中，声学允许将光图解成千分尺尺度的2D点网格，并有可能在单个激光脉冲之间切换模式。我们描述了用于推导AO全息图的算法，用于纯相调制或用于振幅的共同调节。计算重建的相全息图在存在侧叶的情况下显示焦点模式。侧瓣完全被振幅调制所抑制，尽管以减少的光电传输为代价。
Many optical systems use acousto-optics for fast steering of light. However, acousto-optic (AO) light diffraction permits manipulation and shaping of light fields in a much broader sense including holography. While acousto-optic devices operate at incontestable speed, they are one dimensional (1D) diffraction devices depending on analog serial data transfer and as such have a mode of use distinguished from common 2D spatial light modulators. Combination with an amplified laser source allows to clock the serial buildup of AO diffraction patterns for avoidance of phase aberration in the output beam due to acoustic wave progression. Pseudo 2D holography is established with two crossed AO deflectors for biaxial spatial modulation of the input phase, and optionally also of its amplitude. In this configuration, acousto-optics permits light patterning into micrometer-scale 2D point grids with the possibility to switch the pattern between individual laser pulses. We describe algorithms for deriving AO holograms for either pure phase modulation or for a co-modulation of amplitude. Computationally reconstructed phase holograms show focal patterns in presence of side lobes. Side lobes are entirely suppressed by amplitude modulation, though at the expense of reduced optical power transmission.
